Monitoring the Effects of Climate Change on Waterfowl Abundance in the Mississippi Alluvial Valley: Optimizing Sampling Efficacy and Efficiency

Metadata Updated: October 10, 2019

Winter waterfowl surveys have been conducted across much of the United States since 1935. Aerial surveys conducted using stratified random sampling have the advantages of extensive coverage, increased accuracy, and the ability to calculate the variance of estimates. A statistically robust stratified random sampling design for aerial surveys of mallards in the Mississippi Alluvial Valley (MAV) was developed in the late 1980s and early 1990s; surveys based on this sampling design have been conducted by the Mississippi Department of Wildlife, Fisheries, and Parks (MDWFP) in the Mississippi MAV since 2005 and by the Arkansas Game and Fish Commission (AGFC) in the Arkansas MAV since 2009. However, changes in land use since the survey was designed may have made modifications of the original design necessary. We refined strata boundaries in Arkansas using watersheds as a guide in determining strata boundaries and surveyed the Arkansas MAV four times during winter 2011-2012 using this modified design. To evaluate the performance of this new design we compared three sampling designs: 1) simple random, 2) expert opinion-based strata (original design), and 3) watershed-based strata (new design). For each of the four survey periods and each of the three sampling designs, we calculated %CV of the estimated number of mallards and total ducks by bootstrapping the surveyed transects in each survey period 10,000 times each under each of the three sampling designs. The %CV for all ducks and mallards was lower under the new watershed-based stratified random sample than under either the simple random or expert-based designs during all four survey periods. The watershed-based sampling design also estimates waterfowl abundance at a finer resolution using biologically meaningful strata.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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References

https://ecos.fws.gov/ServCat/Reference/Profile/65874

References

https://ecos.fws.gov/ServCat/Reference/Profile/65874

Dates

Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_65874
Maintainer
Brent Frakes
Maintainer Email
Public Access Level public
Bureau Code 010:18
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID C:\Program Files (x86)\FWS\DataStore\Application\OpenData\FWS_ServCat_v1_1.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Data Quality true
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Harvest Object Id 879d9797-c4e8-4233-8a2b-00c4c7d1ccab
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 2013-01-01
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/65874
Data Last Modified 2013-01-01
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/65874"
Source Datajson Identifier true
Source Hash 98cb52bec78f0c4ee9349c02e21a6190d33d473f
Source Schema Version 1.1
Temporal 2011-01-01/2013-01-01
Category "Unpublished Report"

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